Fallopia

Most species are herbaceous to woody lianas (sect. Fallopia), but there are also tall perennials (sect. Reynoutria). In the latter the flowers are functionally unisexual (in the flowers the other sex is only rudimentarily developed in each case). Common features of both sections are the vertically projecting wings on the back of the outer petals and the extrafloral nectaries at the base of the petiole stalk. Recent molecular findings suggest a very close relationship with the genus Muehlenbeckia, which is distributed mainly in the southern hemisphere. Only two species are native to our country, the others are introduced.

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